ISSN: 2250-3005 - ijcer

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International Journal Of Computational Engineering Research (ijceronline.com) Vol. 2 Issue. 81. Parse through the gate level VHDL netlist and skip until the Main Entity within the file is reached.2. Within the Main Entity, extract the name of the inputs and outputs. If the inputs/outputs are declared as a BUS, elaborate thebus entries and assign individual net names for each one of the bus entries. PSpice digital device modeling language does notpermit BUS declaration.3. Using the input and output names obtained, define the subcircuit header in the PSpice circuit file by following the PSpicemodeling language syntax.4. Continue to parse the VHDL file and skip until the Main Architecture of the entity is reached.5. Within the Main Architecture, skip the section where internal signal and component names are declared.6. Scan the architectural definition and identify the Lattice MACH device that is being “port - mapped”7. Use “CASE” statements to map the identified component with its equivalent PSpice model.8. Scan the “port - mapping” definition to identify the input and output net names and assign them toappropriate PSpice model terminals.9. Loop until the end of architecture section is reached.Fig. 2. Flow chart for VHDL-PSpice Conversion program3. Mixed signal Design:The ICM7555 and ICM7556 are CMOS RC timers providing significantly improved performance over the standard SE/NE555/6 and 355 timers, while at the same time being direct replacements for those devices in most applications.Applications1. Precision Timing2. Pulse Generation3. Sequential Timing4. Time Delay Generation5. Pulse Width Modulation6. Pulse Position Modulation7. Missing Pulse DetectorTwo low cost CMOS ICs manage a 12 VDC ,current limited speed control circuit for DC brush motors .the circuit design usesPWM to chop the effective input voltage to the motor. use of cmos devices gives the benefits of low power ,minimal heat andimproved longevity. the overall design is simple ,inexpensive and reliable ,and is useful in application such as embedded .||Issn 2250-3005(online)|| ||December||2012|| Page 221
International Journal Of Computational Engineering Research (ijceronline.com) Vol. 2 Issue. 8Fig1. ICM7555 (8 LD PDIP, SOIC)Although the supply current consumed by the ICM7555 and ICM7556 devices is very low, the total system supply current canbe high unless the timing components are high impedance. Therefore, use high values for R and low values for C in Figures 2Circuit concept:Low –cost DC Motor Speed control with CMOS ICs - A CMOS update of the popular -555 timer device is usedbecause it draws much lower operating currents and then runs cooler and lasts longer in typing operating environments, byadjusting the wiper of the speed –control potentiometer, output-signal duty cycle ,or pulse width ,can be varied from 2% to98%.operating frequency is fixed at 20khz,to remain in the inaudible range.Two signals are generated: The PWM signal ,and a direction signal (high=forward ,low=reverse ).these signals become inputsto the TC4469, a CMOS quad MOSFET driver .its logic inputs allow proper output chopping and commutation. Similar wayusing ICs&transistor PWM Driving DC Motor using embedded Technology and its implemented on VLSI Technology(Fig2&3)Fig .2. 12VDC Speed control and current limitFig 3. PWM Driving DC Motor||Issn 2250-3005(online)|| ||December||2012|| Page 222
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ISSN: 2250-3005 - ijcer

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